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FIPP Thermoplastic Forming Process

Pre-formed PVC liner pull-in with heat-and-pressure expansion — DN150 to DN1000

Overview

The FIPP Thermoplastic Forming Process explained

FIPP (Formed-In-Place Pipe) thermoplastic forming installs a factory-prefabricated liner via pull-in, then expands it via heat and pressure to fit tightly against the host pipe. The seamless monolithic structure has no intermediate joints and adapts to virtually any cross-sectional shape.

Working principle

The liner is manufactured at the factory in an H-shape or other pre-folded profile that significantly reduces its cross-sectional volume — to roughly one-third of original size. This reduced-volume liner is wound onto a spool, transported to site, then heated and pulled into the host pipeline. Combined heating and pressurization expand the liner to match the host pipe diameter, after which ambient or chilled gas cools and sets the liner.

FIPP Thermoplastic Forming Process
Step-by-Step

Process Stages

From pre-installation inspection through post-cure acceptance — here's the full project workflow.

Pipe Survey

Confirm host pipe diameter, length, and bends.

Liner Pre-forming

Factory H-shape or folded liner reduces cross-section for insertion.

Heating

Steam or other heat source softens the thermoplastic liner.

Pull-in

Traction equipment pulls the heated liner through the host pipe.

Expansion

Heat + pressure expands the liner to match host pipe inner diameter.

Cooling

Ambient or chilled gas cools and sets the liner in final shape.

Trimming

Liner ends trimmed at terminal manholes.

Inspection

Post-installation CCTV verification.

Why this method

Key advantages

  • Suitable for any cross-sectional shape (circular, square, arched, rounded rectangle)
  • Compatible with pipelines having up to 90° bends
  • No intermediate joints across long sections
  • Mature thermoplastic technology with stable performance
  • Operating temperature -30°C to 55°C
  • Single operation length up to 400 meters

Is FIPP Thermoplastic Forming right for your project?

Send your pipe diameter, length, and host material — our engineers will recommend the optimal method for your specific project conditions.

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